Pulley.



No. 64!,4l6. Patented Jan. I6, I900. A. STROUD.

PULLEY.

"Application filed May 15. 1899.)

No Model.)

71 Z [k 0 O m 0 w I 0 6 0 5 7/2 WM/WWO: Mm/MOT? 0.1140,. M4 Jill 144 fixm l x AL d w mwm/ k,

1n: nonnls PETERS co. moYuLrYuQ. WASHINGTON, mV :2.

UNITED STATES PATENT OFFICE,

ARNOLD STROUD, OF LONDON, ENGLAND.

PU LLEY.

SPECIFICATION forming part of Letters Patent No. 641,416, dated January16, 1900;

Application filed May 1 5,1899. Serial No. 716,885 (No model.)

T0 00% whom it may concern:

Be it known that I, ARNOLD STROUD, a subject of the Queen of GreatBritain and Ireland, residing at Winterford View, Oranleigh, Guildford,London, in the county of Surrey, England, have invented new and usefulImprovements in Driving and other Pulleys, (for which I have applied fora patent in Great Britain, No. 5,538, bearing date 14th of March, 1899,)of which the following is a specification.

My invention relates to improvements in driving and other pulleys; andthe object is to provide means whereby the diameter of a pulley can bealtered, so as to take up any slackness of the driving or driven beltwhich may occur during use.

In carrying my invention into effect I proceed in or in about thefollowing manner, making reference to the accompanying drawings, inwhich Figure 1 is aside view, Fig. 2 a section through line A B, Fig. 1and Fig. 3 a section through line C D, Fig. 1, of a pulley made inaccordance with my invention.

I provide a split or other boss a, which is split at right angles to theaxis of the eye, as at b. Each opposing face at b is grooved so .as toprovide holes 0, in which are free to move the inner ends 61 of thespokes or arm e. The two longitudinal parts of the boss are fastenedtogether by the bolts f. Slots are provided in the spokes e, and inthese slots are fitted the Wedges 9. These Wedges are arranged on a ringfree to slide on the boss a, or in the case of a split boss they may bearranged on a segment, such as h, which can be held in position by studs2', passing freely through holes in the segment and into the boss or,inner and outer nuts j and j being e and e are open slots m, and thespokes e and c are free to slide in these slots. The inner plates Z arealso slotted near the center, as at n, and headed pins 0 pass throughthese slots into the plates is. When it is required to increase thediameter of the pulley, the bolts f are slackened and the segments hmoved in, thus causing the Wedges to act in the slots at the ends of thespokes and so lengthen the spokes and increase the diameter, thesegmental plates lo and Z sliding over one another and accommodatingthemselves to the increased diameter. The bolts f are then againtightened up.

What I claim as my invention, and desire to secure by Letters Patent,is-

An expansible pulley comprising a rim formed of plates adapted to slideover one another, spokes or arms secured to the outer plates of the rimand certain of said spokes or arms also secured to the inner plates andall the spokes passing through slots in said inner plates, the spokeshaving their inner ends slotted, a sectional pulley, hub or boss looselyreceiving the slotted ends of the spokes or arms, wedges carried by theboss and adapted to enter the slots in the spokes and adjust said spokesand the rim-plates, and means for securing the sections of the hub andthe Wedges in position, substantially as set forth.

ARNOLD STROUD.

Witnesses:

DAVID MANN, ARTHUR PARSONS.

